First you select the power of your electric motor. Electric motor power is stated in watts. 750 watts = 1 horsepower. An easy way to estimate power needs is to use 100 watts per pound for sport flying, 150 for aggressive aerobatics, 200 watts per pound for 3D flying
You can buy the motor from Amazon and then you get an automatic recommendation on the ESC and battery that most people bought with that motor.
You connect the motor to the ESC, then the ESC to the receiver and the battery. If the motor spins the wrong way, you need to swap two of the 3 wires from the motor to ESC.
But always safety first: Make sure the ECS supports the battery voltage. Never install the propeller until your ESC, receiver and transmitter are fully configured. For the size of your plane, the propeller is very dangerous, be very careful.
Good luck with your electric conversion. You will love its convenience and simplicity.
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